Implementation and performance analysis of real-time digital filter for audio signals

A real-time digital filter can perform filtering operation on real-time signals. This paper presents the implementation and performance analysis of real-time FIR (finite impulse response) digital filter on audio signals. Digital filters (low pass, high pass and band pass) implemented using DSP block sets are used to remove the higher and lower frequency components of real-time voice signals. This paper evaluates the performances of these digital filters in terms of the filtered output and the frequency response curves. Experimental results indicate that a maximum number of ripples appear in stop band for Kaiser window, while a minimum number of ripples appear in triangular window for different filters. Thus, real-time FIR digital filter using triangular window gives the optimal result to process the audio signals.